标准砂直剪试验数值模拟研究

Numerical Simulation of Direct Shear Tests on Standard Sand

摘要:

利用PFC(Particle Flow Code)软件探讨颗粒摩擦系数、颗粒刚度、颗粒形状、试样孔隙率对直剪宏观力学行为的影响,并将模拟结果与室内土工试验结果对比,所得到的数值模型基本再现标准砂直剪试验。结果表明PFC程序模拟标准砂的基本力学行为是可行的,这一结果可为今后标准砂的数值模拟实验提供一定的思路和参考。

Abstract:

By indoor direct shear tests, we acquired quantitative results from different sides of standard sand structures. The increasing complexity of the test method and a growing number of structural elements compelled people to consider the mesoscopic structural elements in combination with the macro mechanical properties. Currently, parameter analysis relies mainly on the numerical simulations of this method. The PFC(Particle Flow Code) is the commonly used simulation software. PFC takes the internal structure of the medium as the basic unit(particle and contact) and studies the mechanical characteristics and mechanics of the medium system's response from the perspective of the media structure's mechanical behavior. This study discusses the influence of particle friction coefficient, particle stiffness, particle shape, the porosity of sample to direct shear macroscopic mechanical behavior, and compares the simulation results and laboratory soil test results. The resulting numerical model mainly recreates the direct shear test of standard sand. Results show that the PFC process simulation standard for the basic mechanical behavior of sand is feasible, and the results provide reference for future numerical simulation experiments for standard sand.